Noscript does't sound familiar and I don't know if it applies to me. Is it a part of WordPress? If it's a software that you buy or download, I don't have it. Could there be another explanation? Thanks.

I was referring to 'Noscript Clearclick', this is a add-on/extension for the Firefox browser. It's possible that it's pre-installed if you're working from a corporate network. In that case please contact your local network/system administrator to help you further.

Well I installed the Noscript-application long time before.
Never got stressed with it until now. The blog-mainpage appeared for a year but now it always shows me "You do not have permission to preview drafts."
But the message just appears when I klick on that like-mark.